1/(2*5)+1/(3*6)+...+1/(n+1)(n+4) 收敛性 请用比较审敛法判定
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1/(2*5)+1/(3*6)+...+1/(n+1)(n+4)收敛性请用比较审敛法判定1/(2*5)+1/(3*6)+...+1/(n+1)(n+4)收敛性请用比较审敛法判定1/(2*5)+1/(3
1/(2*5)+1/(3*6)+...+1/(n+1)(n+4) 收敛性 请用比较审敛法判定
1/(2*5)+1/(3*6)+...+1/(n+1)(n+4) 收敛性 请用比较审敛法判定
1/(2*5)+1/(3*6)+...+1/(n+1)(n+4) 收敛性 请用比较审敛法判定
0<1/(n+4)(n+1)<1/n^2
而级数1/n^2是收敛的,所以收敛!
1/2,1/3,5/6,( ),12/6,( )
1/6、1/3、1/2( )、5/6、1.
6-5×(-1/2)3次方
(1+2/1)(1+4/1)(1+6/1).(1+10/)(1-3/1)(1—5/1).(1-9/1)
(-1/4)+5/6+2/3-1/2
1/6(3×-6)=2/5x-3
2/3,1,6/5,4/3,( ),3/2
()3( ) × ( )6 ------------- 1 ( )( ) 6( ) ( ) 5------------- 8 ( )( ) ( )()3( ) × ( )4 ------------- 2 ( )2 8( )1 ( ) 0------------- 3 ( ) 1 ( ) 8
1.(1+1/2+1/3+1/4)*(1/2+1/3+1/4+1/5)-(1+1/2+1/3+1/4+1/5)*(1/2+1/3+1/4)=2.(1+1/2+1/3+1/4+1/5)*(1/2+1/3+1/4+1/5+1/6)-(1+1/2+1/3+1/4+1/5+1/6)*(1/2+1/3+1/4+1/5)=
1 3/4-5/6-(+1 1/6)-(-1/2)
(-1 2/3)乘1/5-|-5/6|除以(+ 2 1/2)等于多少?
①(1/5)-(-2/5)+3/5 ②(-1/3)-5/6-1/6 ③(-51/6)-21/3+(①(1/5)-(-2/5)+3/5②(-1/3)-5/6-1/6③(-51/6)-21/3+(-1/2)④-5-(-2.5)+(-1/2)
1/(1*3)+1/(2*4)+1/(3*5)+1/(4*6)+...+1/(8*10)=?
1/(1×2×3)+1/(2×3×4)+1/(4×5×6)、、、、+1/(48×49×50)
(1 3 5 .1991)-(2 4 6 .1990)
1,3,2,6,5,15,14,( ),( ),123
简算,(3/1-0.25)/2/1+6/5
[5/6-(1/2-1/3)]×9/10